Audio Database

The

ROTEL RX-400A
45,800yen(around the 1973 time)

Description
 
The stereo receiver which contained 4ch speaker matrix.

The triple variable condenser and high-sensitivity low noise FET are adopted as FM front end.
Moreover, the six-step amplification IF circuitry and the ceramics filter are adopted.

The SEPP output circuit is adopted.


Rating of a mode
Form FM / AM-stereo receiver
<Audio part>
Music power (IHF) 80W (4ohm)
60W (8ohm)
Effective output One-side-channel drive: 20W/20W (8ohm)
Both ch(es) drive: 17W+17W (8ohm)
THD (1kHz) 0.3% (at the time of 15W output)
0.2% (at the time of 1W output)
Cross modulation distortion (70Hz:7kHz=4:1) 0.2% (at the time of 15W output)
0.15% (at the time of 1W output)
Frequency characteristic 15Hz - 70kHz (at the time of 1W output)
17Hz - 55kHz (at the time of 20W output)
Output band property 20Hz - 40kHz
Dumping factor 30 (8ohm)
S/N ratio Phono:60dB
Aux:70dB
Remains noise 1mV
Input sensitivity/impedance Phono: 3mV / 50kohm
Aux: 200mV / 100kohm
Tape in: 400mV / 15kohm
Tone control Bass: ±13dB (50Hz)
Trebel: ±13dB (10kHz)
Loudness control +10dB(50Hz)
<FM tuner part>
Antenna impedance A 300ohm equilibrium / 75ohm unbalance
Sensitivity (IHF) 2.0 microvolts
THD (400Hz, 100% modulation) mono:0.5%
stereo:1%
S/N ratio 65dB or more
Image stonewalling ratio 50dB or more
Spurious response 80dB
Intermediate-frequency-jamming ratio 80dB
Capture ratio 3dB
Selectivity (IHF) 45dB
Separation 35dB or more (1kHz)
SCA supression ratio 60dB
AM supression ratio 40dB
Stereo mono-auto level 50 microvolts
<AM tuner part>
Practical speed 25 microvolts (S/N=20dB)
Image ratio (1MHz) 50dB
Intermediate-frequency-jamming ratio (1MHz) 50dB
S/N ratio 50dB
<Synthesis>
The semiconductor used Transistor: 40 pieces
FET: One piece
Diode: 21 pieces
Ceramics filter: One piece
Power consumption 140VA
Dimensions Width 435x height 130x depth of 320mm
Weight 7kg